The phrase "structural abnormalities" refers to irregularities or problems in the physical structure or composition of something. It means that there are unusual or flawed aspects in the way something is built or put together. Full definition
Current prenatal screening protocols for common structural abnormalities in the chromosomes vary among countries and medical practices. (sciencedaily.com)
If you have a history of premature birth caused by structural abnormalities of the uterus, these abnormalities may be corrected with surgery before you become pregnant. (aboutkidshealth.ca)
Chronic adolescent hip pain often strikes young athletes with structural abnormalities sooner than their less active counterparts, due to the stress their level of activity places on the hip. (sportstarsmag.com)